plymouthd crashed with SIGSEGV in script_obj_deref_direct()

[Bob Davidson]

Continuing problem.

ProblemType: Crash
DistroRelease: Ubuntu 18.04
Package: plymouth 0.9.3-1ubuntu6
ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
Uname: Linux 4.15.0-13-generic x86_64
ApportVersion: 2.20.9-0ubuntu4
Architecture: amd64
CrashCounter: 1
Date: Wed Apr 11 07:40:13 2018
DefaultPlymouth: /usr/share/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth
ExecutablePath: /sbin/plymouthd
InstallationDate: Installed on 2018-04-07 (3 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Beta amd64 (20180404)
MachineType: Apple Inc. iMac11,2
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-13-generic root=UUID=1844e8ce-68b5-462e-ab6a-ea68a5511a50 ro quiet splash vt.handoff=1
ProcCmdline: @sbin/plymouthd --mode=boot --pid-file=/run/plymouth/pid --attach-to-session
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-13-generic root=UUID=1844e8ce-68b5-462e-ab6a-ea68a5511a50 ro quiet splash vt.handoff=1
SegvAnalysis:
 Segfault happened at: 0x7fcba1356480 <script_obj_deref_direct>: cmpl $0x1,(%rdi)
 PC (0x7fcba1356480) ok
 source "$0x1" ok
 destination "(%rdi)" (0x00000000) not located in a known VMA region (needed writable region)!
SegvReason: writing NULL VMA
Signal: 11
SourcePackage: plymouth
StacktraceTop:
 script_obj_deref_direct () from /usr/lib/x86_64-linux-gnu/plymouth/script.so
 script_obj_as_custom () from /usr/lib/x86_64-linux-gnu/plymouth/script.so
 script_execute_object () from /usr/lib/x86_64-linux-gnu/plymouth/script.so
 script_lib_plymouth_on_display_normal () from /usr/lib/x86_64-linux-gnu/plymouth/script.so
 ?? () from /usr/lib/x86_64-linux-gnu/plymouth/script.so
TextPlymouth: /usr/share/plymouth/themes/ubuntu-text/ubuntu-text.plymouth
Title: plymouthd crashed with SIGSEGV in script_obj_deref_direct()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

dmi.bios.date: 02/02/18
dmi.bios.vendor: Apple Inc.
dmi.bios.version: IM112.88Z.005C.B00.1802021644
dmi.board.name: Mac-F2238AC8
dmi.board.vendor: Apple Inc.
dmi.chassis.type: 13
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-F2238AC8
dmi.modalias: dmi:bvnAppleInc.:bvrIM112.88Z.005C.B00.1802021644:bd02/02/18:svnAppleInc.:pniMac11,2:pvr1.0:rvnAppleInc.:rnMac-F2238AC8:rvr:cvnAppleInc.:ct13:cvrMac-F2238AC8:
dmi.product.family: iMac
dmi.product.name: iMac11,2
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1745406, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.